Liver regeneration is a complex process regulated by many complex mechanisms involving cytokines, growth factors, metabolic networks, and so forth. Previous investigations have demonstrated that matrix metalloproteinase-9 (MMP-9) is an essential factor in liver regeneration. The present study aimed to explore the role of MMP-9 in epidermal growth factor receptor (EGFR) signaling and related proliferation signaling factors in a mouse partial hepatectomy (PH) model.